Tobey, John, author
Study guide to accompany Nanney and Cable's trigonometry
Allyn and Bacon, 1980
 Buku Teks
Dodge, Clayton W., author
The circular functions
Prentice-Hall, 1966
 Buku Teks
Moyer, Robert E., author
Schaum's outlines: trigonometry
McGraw-Hill, 2009
 Buku Teks
In-plane displacement measurement by using double beam method
 Artikel Jurnal
Marcus, Marvin, author
Algebra and trigonometry
Houghton Mifflin, 1970
 Buku Teks
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